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Why does the color in each tube change if it's the same type of gas?
Geissler Tubes are helpful in explaining how pressure affects the glow that is emitted by a gas when a high voltage is added.
In this project, the vacuumed tubes are filled with regular air but set at pressures 40 mmHg, 10 mmHg, 3 mmHg, 1 mmHg, 0.1 mmHg, and 0.02 mmHg.
The 4-1-1 on my project
The project is called Geissler Tubes. Each tube is filled with regular air but set at different pressure rates. These tubes are measured in millimeters of mercury (Hg) which is equivalent to 1 torr. At a low enough pressure, you will first see a bright violet glow. Whe you start to decrease the pressure, you'll see different colors being emitted. With the tubes we have at school, it's sort of difficult to distinguish the colors but it helps prove out main point. At 0.02 mmHg, the lowest pressure, we can see that there's a grean glow that surrounds the tube; This glow is called Crooke's Dark Space.
Procedures
Foremost, adult supervision is highly recommended because of high voltage energy produced by the Tesla coil. When setting up the Geissler tubes, it is important to order them from highest to lowest pressure. By doing this we will be able to distinguish the change in color.
Safety Regulations:
The Tesla coil is a device that exerts high voltages of energy. It is highly recommended to do this project under adult supervision. The Geissler Tubes are also very sensitive. Please handle with care.
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